Beater Attachment for a Handheld Mixer

FIG. 1 is a perspective view of a beater attachment for a handheld mixer according to the design; FIG. 2 is a front elevation view thereof with a back elevation view being identical thereto; FIG. 3 is a right side elevation view thereof with a left elevation view being identical thereto; FIG. 4 is a top plan view thereof; FIG. 5 is a bottom plan view thereof; and, FIG. 6 is a partial enlarged perspective view thereof according to the area indicated in FIG. 1 . The portions of the article shown in broken line form no part of the claimed design. Dash-dot-dash broken lines adjacent un-shaded areas represent bounds of the claimed design and form no part of the claimed design themselves.